687762660623 has 2 divisors, whose sum is σ = 687762660624. Its totient is φ = 687762660622.

The previous prime is 687762660523. The next prime is 687762660659. The reversal of 687762660623 is 326066267786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687762660623 - 2⁸ = 687762660367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687762660023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343881330311 + 343881330312.

It is an arithmetic number, because the mean of its divisors is an integer number (343881330312).

Almost surely, 2^687762660623 is an apocalyptic number.

687762660623 is a deficient number, since it is larger than the sum of its proper divisors (1).

687762660623 is an equidigital number, since it uses as much as digits as its factorization.

687762660623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36578304, while the sum is 59.

The spelling of 687762660623 in words is "six hundred eighty-seven billion, seven hundred sixty-two million, six hundred sixty thousand, six hundred twenty-three".